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(Courtesy Chicago Park District and Chicago History Museum)

“From Swans to Science: 150 Years of Lincoln Park Zoo” takes visitors on a journey through the zoo’s 150-year history, which started with a gift of four swans in 1868.

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Michelle Soszynski, a senior veterinary technician at Brookfield Zoo, monitors Layla, a 7.5-year-old eastern black rhinoceros, as she receives a CT scan inside Brookfield Zoo’s Pachyderm House. (Jim Schulz / Chicago Zoological Society)

Following a historic diagnostic procedure last month, Layla, a 2,300-pound eastern black rhinoceros, underwent life-saving surgery last week to relieve an infection.

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An illustration of the newly identified Palawan moss shrew. (Velizar Simeonovski / The Field Museum)

A mole-like mammal known as the Palawan moss shrew was recently discovered in the Philippines by a team of researchers – including one from Chicago.

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A Magellanic penguin chick hatched May 12 at Shedd Aquarium. (Courtesy Shedd Aquarium)

A new Magellanic penguin chick hatched Saturday at Shedd Aquarium, just hours before Mother's Day. 

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A “chicken in distress” call last month led to an unusual rescue effort in Lincoln Park – and an award for the Chicago Police Department.

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(Dr. Matt O’Connor / ©Shedd Aquarium)

A Chicago-based animal care expert is playing a key role in an unprecedented effort to save thousands of critically endangered tortoises that were found in squalid conditions in an abandoned home off the southeast coast of Africa.

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(Tanya Martinez / Puerto Rico Department of Natural and Environmental Resources)

One of the world’s most endangered birds finds itself in even greater peril after a hurricane ripped through its habitat last year. But you can help – by drinking beer. 

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(Brenna Hernandez / ©Shedd Aquarium)

New residents of the aquarium’s “At Home on the Great Lakes” exhibit are spending their first days bonding with their mother. 

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(Courtesy of Peggy Notebaert Nature Museum)

We peek behind the scenes at an exotic butterfly sanctuary in Chicago, and learn how volunteers help scientists track butterfly populations.

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(Courtesy Chicago Botanic Garden)

Remember Spike the corpse flower? The plant made famous in 2015 for being the first of its kind to (nearly) bloom in Chicago is on the comeback trail – and climbing to new heights.

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(Courtesy Chicago Zoological Society)

Hoping to identify the source of an infection, veterinarians performed what is thought to be the first ever CT scan on a rhinoceros.

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(Phil Torres and Geoff Wheat / The Field Museum)

A team of scientists was exploring a rocky patch of ocean floor when they found something that shouldn’t have been there: octopuses – lots of them.

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(Wisconsin Department of Natural Resources / Dan Nedrelo)

Spring serves as mating season for all sorts of animals found in Illinois, but no creature goes about it quite like the wood frog.

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A common musk turtle (Colin Osborn / U.S. Fish and Wildlife Service)

We meet some rare and remarkable critters that are part of this weekend’s annual Reptile Fest.

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(Courtesy Chicago Zoological Society)

The 50-year-old gorilla was the zoo’s oldest animal. “Knowing it’s the right decision doesn’t make it hurt any less,” said Amy Roberts, curator of mammals for the Chicago Zoological Society.

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An African penguin chick hatched Feb. 10 at Lincoln Park Zoo, pictured here at 21 days old. (Courtesy Lincoln Park Zoo)

On Feb. 10, Lincoln Park Zoo welcomed a new baby bird, the first African penguin chick hatched and reared at the zoo's new penguin habitat.